/**
 * Copyright (c) 2021 OceanBase
 * OceanBase CE is licensed under Mulan PubL v2.
 * You can use this software according to the terms and conditions of the Mulan PubL v2.
 * You may obtain a copy of Mulan PubL v2 at:
 *          http://license.coscl.org.cn/MulanPubL-2.0
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
 * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
 * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 * See the Mulan PubL v2 for more details.
 */

#ifndef OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_SYS_CONNECT_BY_PATH_
#define OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_SYS_CONNECT_BY_PATH_

#include "sql/engine/expr/ob_expr_operator.h"
#include "sql/engine/connect_by/ob_nl_cnnt_by_with_index_op.h"

namespace oceanbase {
namespace sql {
class ObExprSysConnectByPath : public ObExprOperator {
public:
  explicit ObExprSysConnectByPath(common::ObIAllocator& alloc);
  virtual ~ObExprSysConnectByPath()
  {}
  virtual int calc_result_type2(
      ObExprResType& type, ObExprResType& type1, ObExprResType& type2, common::ObExprTypeCtx& type_ctx) const override;
  virtual int calc_result2(
      common::ObObj& result, const common::ObObj& left, const common::ObObj& right, common::ObExprCtx& expr_ctx) const override;
  virtual int cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
  static int calc_sys_path(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
  static int eval_sys_connect_by_path(
      const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum, ObNLConnectByOpBase* connect_by_op);

private:
  static int StringContain(const common::ObString& src_str, const common::ObString& sub_str, bool& is_contain,
      common::ObCollationType cs_type);
  DISALLOW_COPY_AND_ASSIGN(ObExprSysConnectByPath) const;
};
}  // namespace sql
}  // namespace oceanbase
#endif  // OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_SYS_CONNECT_BY_PATH_
